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          <section>
            <section class="section">
              <h1>Classes</h1>
              <p>The following classes are available globally.</p>

            </section>
            <section class="section task-group-section">
              <div class="task-group">
                <ul>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit10ConnectionC"></a>
                      <a name="//apple_ref/swift/Class/Connection" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit10ConnectionC">Connection</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>A connection to a Postgres server.</p>

<p>The <code><a href="Structs/ConnectionConfiguration.html">ConnectionConfiguration</a></code> used to create a <code>Connection</code> specifies the hostname and port
number of the Postgres server, the username and database to use, and other characteristics
of the connection.</p>

<p>Connections are used to perform SQL statements.  To perform a SQL statement:</p>

<ul>
<li>Call <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16prepareStatement4textAA0F0CSS_tKF">Connection.prepareStatement(text:)</a></code> to parse the SQL text and return a <code><a href="Classes/Statement.html">Statement</a></code>.</li>
<li>Call <code><a href="Classes/Statement.html#/s:17PostgresClientKit9StatementC7execute15parameterValues22retrieveColumnMetadataAA6CursorCSayAA0A16ValueConvertible_pSgG_SbtKF">Statement.execute(parameterValues:retrieveColumnMetadata:)</a></code> to execute the statement
and return a <code><a href="Classes/Cursor.html">Cursor</a></code>.</li>
<li>Iterate over the <code><a href="Classes/Cursor.html">Cursor</a></code> to retrieve the rows in the result.</li>
<li>Close the <code><a href="Classes/Cursor.html">Cursor</a></code> and the <code><a href="Classes/Statement.html">Statement</a></code> to release resources on the Postgres server.</li>
</ul>

<p>A <code><a href="Classes/Statement.html">Statement</a></code> can be repeatedly executed, and the values of its parameters can be different
each time.  This is more efficient than having the Postgres server repeatedly parse the same
SQL text.</p>

<p>A <code>Connection</code> performs no more than one SQL statement at a time.  When
<code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16prepareStatement4textAA0F0CSS_tKF">Connection.prepareStatement(text:)</a></code> or <code><a href="Classes/Statement.html#/s:17PostgresClientKit9StatementC7execute15parameterValues22retrieveColumnMetadataAA6CursorCSayAA0A16ValueConvertible_pSgG_SbtKF">Statement.execute(parameterValues:retrieveColumnMetadata:)</a></code>
is called, any previous <code><a href="Classes/Cursor.html">Cursor</a></code> for the <code>Connection</code> is closed.</p>

<p>The following methods also close any previous <code><a href="Classes/Cursor.html">Cursor</a></code> for the <code>Connection</code>:</p>

<ul>
<li><code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16beginTransactionyyKF">Connection.beginTransaction()</a></code></li>
<li><code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC17commitTransactionyyKF">Connection.commitTransaction()</a></code></li>
<li><code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC19rollbackTransactionyyKF">Connection.rollbackTransaction()</a></code></li>
<li><code><a href="Classes/Statement.html#/s:17PostgresClientKit9StatementC5closeyyF">Statement.close()</a></code></li>
<li><code><a href="Classes/Cursor.html#/s:17PostgresClientKit6CursorC5closeyyF">Cursor.close()</a></code></li>
</ul>

<p>To concurrently perform more than one SQL statement, use multiple connections.</p>

<p>By default, each <code><a href="Classes/Statement.html">Statement</a></code> is executed in its own transaction.  The statement&rsquo;s transaction is
automatically rolled back if an error occurs in executing the statement, and is automatically
commited upon any of the following events:</p>

<ul>
<li>if there are no rows in the result: upon completion of <code>Statement.execute()</code></li>
<li>if the result has one or more rows: after the final row has been retrieved (in other words,
when <code><a href="Classes/Cursor.html#/s:17PostgresClientKit6CursorC4nexts6ResultOyAA3RowVs5Error_pGSgyF">Cursor.next()</a></code> returns <code>nil</code>)</li>
<li>when the <code><a href="Classes/Cursor.html">Cursor</a></code> is closed (in any of the ways listed above)</li>
</ul>

<p>Alternately, transactions can be explicitly demarcated by performing the SQL <code>BEGIN</code>, <code>COMMIT</code>,
and <code>ROLLBACK</code> commands (or equivalently, the <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16beginTransactionyyKF">Connection.beginTransaction()</a></code>,
<code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC17commitTransactionyyKF">Connection.commitTransaction()</a></code>, and <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC19rollbackTransactionyyKF">Connection.rollbackTransaction()</a></code> methods).</p>

<p>No more than one thread may concurrently operate against a <code>Connection</code> (including its
<code><a href="Classes/Statement.html">Statement</a></code> and <code><a href="Classes/Cursor.html">Cursor</a></code> instances).  However, multiple threads may concurrently operate
against different connections.</p>

<p>When a <code>Connection</code> is no longer required, call <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC5closeyyF">Connection.close()</a></code> to release its Postgres
server resources and close the network socket.  A <code>Connection</code> is automatically closed by its
deinitializer, or if an unrecoverable error occurs (for example, if the Postgres server closes
the network socket).  Use <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC8isClosedSbvp">Connection.isClosed</a></code> to test whether a <code>Connection</code> is closed.</p>

                          <a href="Classes/Connection.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">Connection</span> <span class="p">:</span> <span class="kt">CustomStringConvertible</span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit14ConnectionPoolC"></a>
                      <a name="//apple_ref/swift/Class/ConnectionPool" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit14ConnectionPoolC">ConnectionPool</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>A pool of re-usable, interchangeable <code><a href="Classes/Connection.html">Connection</a></code> instances.</p>

<p>Using a <code>ConnectionPool</code> allows an application to acquire an existing <code><a href="Classes/Connection.html">Connection</a></code> from the
pool, use that connection to perform one or more SQL statements, and then release it for use
elsewhere in the application.</p>

<p>The <code><a href="Structs/ConnectionPoolConfiguration.html">ConnectionPoolConfiguration</a></code> used to create a <code>ConnectionPool</code> specifies the number of
connections in the pool, how long a request for a connection will wait for a connection to
become available, and other characteristics of the pool.</p>

<p>All connections in a <code>ConnectionPool</code> are created from the same <code><a href="Structs/ConnectionConfiguration.html">ConnectionConfiguration</a></code>.
They also have the same <code><a href="Protocols/ConnectionDelegate.html">ConnectionDelegate</a></code> (if a delegate is specified).  Consequently
any connection in a pool is interchangeable with any other.</p>

<p>Use <code><a href="Classes/ConnectionPool.html#/s:17PostgresClientKit14ConnectionPoolC07acquireD017completionHandleryys6ResultOyAA0D0Cs5Error_pGc_tF">ConnectionPool.acquireConnection(completionHandler:)</a></code> to request a connection from a
<code>ConnectionPool</code>.  This method is non-blocking: its completion handler is asynchronously
executed when a connection is successfully allocated to the request or if an error occurs.
To release the connection back to the pool, call <code><a href="Classes/ConnectionPool.html#/s:17PostgresClientKit14ConnectionPoolC07releaseD0yyAA0D0CF">ConnectionPool.releaseConnection(_:)</a></code>.</p>

<p>Alternately, use <code><a href="Classes/ConnectionPool.html#/s:17PostgresClientKit14ConnectionPoolC04withD017completionHandleryys6ResultOyAA0D0Cs5Error_pGc_tF">ConnectionPool.withConnection(completionHandler:)</a></code> to acquire a connection
that is automatically released after execution of the completion handler.</p>

<p>When a connection is released to a <code>ConnectionPool</code>, there should be no transaction underway.
Pair each SQL <code>BEGIN</code> command with either a <code>COMMIT</code> or <code>ROLLBACK</code> command (or equivalently,
use the <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16beginTransactionyyKF">Connection.beginTransaction()</a></code>, <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC17commitTransactionyyKF">Connection.commitTransaction()</a></code>, and
<code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC19rollbackTransactionyyKF">Connection.rollbackTransaction()</a></code> methods).</p>

<p>In general, do not close a <code><a href="Classes/Connection.html">Connection</a></code> acquired from a <code>ConnectionPool</code>.  If a connection is
closed (whether explicitly or because of an unrecoverable error) then, when that connection is
released, it will be discarded from the pool, allowing a new connection to be created and added
to the pool.</p>

<p>The <code>ConnectionPool</code> class is threadsafe: multiple threads may concurrently operate against a
<code>ConnectionPool</code> instance.  Connections acquired from the pool are subject to the threadsafety
constraints described by the API documentation for <code><a href="Classes/Connection.html">Connection</a></code>.</p>

                          <a href="Classes/ConnectionPool.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">ConnectionPool</span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit6CursorC"></a>
                      <a name="//apple_ref/swift/Class/Cursor" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit6CursorC">Cursor</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>The result of successfully executing a <code><a href="Classes/Statement.html">Statement</a></code>.</p>
<div class="aside aside-note">
    <p class="aside-title">Note</p>
    Do not confuse this <code>Cursor</code> class with the SQL cursors created by the <a href="https://www.postgresql.org/docs/12/sql-declare.html">SQL DECLARE
command</a>.  The <code>Cursor</code> class exposes
the result of executing a <em>single</em> SQL command.  A SQL cursor, on other other hand, exposes
a query&rsquo;s result by <em>repeated</em> execution of the SQL <code>FETCH</code> command.

</div>

<p>When a <code>Cursor</code> is no longer required, call <code><a href="Classes/Cursor.html#/s:17PostgresClientKit6CursorC5closeyyF">Cursor.close()</a></code> to release its Postgres server
resources.  A <code>Cursor</code> is implicitly closed as a side effect of certain operations on a
connection; refer to the <code><a href="Classes/Connection.html">Connection</a></code> documentation for a full list.  A <code>Cursor</code> is also
automatically closed by its deinitializer.</p>

<p>A <code>Cursor</code> in PostgresClientKit corresponds to the unnamed portal of the connection on the
Postgres server.</p>
<div class="aside aside-see-also">
    <p class="aside-title">See also</p>
    <a href="https://www.postgresql.org/docs/12/protocol-flow.html#PROTOCOL-FLOW-EXT-QUERY">Postgres: Message Flow - Extended
Query</a>

</div>

                          <a href="Classes/Cursor.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">Cursor</span> <span class="p">:</span> <span class="kt">Sequence</span><span class="p">,</span> <span class="kt">IteratorProtocol</span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit17ConsoleLogHandlerC"></a>
                      <a name="//apple_ref/swift/Class/ConsoleLogHandler" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit17ConsoleLogHandlerC">ConsoleLogHandler</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>A log handler that prints log records to standard output.</p>

                          <a href="Classes/ConsoleLogHandler.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">ConsoleLogHandler</span> <span class="p">:</span> <span class="kt"><a href="Protocols/LogHandler.html">LogHandler</a></span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit6LoggerC"></a>
                      <a name="//apple_ref/swift/Class/Logger" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit6LoggerC">Logger</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>Logs events of interest.</p>

<p>A <code><a href="Structs/LogRecord.html">LogRecord</a></code> describes a loggable event.  Each record has a level which reflects the importance
of the event.  If the log level of a record is at least as high as the <code>level</code> of the logger,
the logger dispatches the record to the logger&rsquo;s current <code>handler</code>.</p>

<p>Example:</p>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">logger</span> <span class="o">=</span> <span class="kt">Logger</span><span class="p">()</span>
<span class="n">logger</span><span class="o">.</span><span class="n">level</span> <span class="o">=</span> <span class="o">.</span><span class="n">warning</span>
<span class="n">logger</span><span class="o">.</span><span class="n">handler</span> <span class="o">=</span> <span class="kt">ConsoleLogHandler</span><span class="p">()</span>

<span class="k">let</span> <span class="nv">record</span> <span class="o">=</span> <span class="kt">LogRecord</span><span class="p">(</span><span class="nv">level</span><span class="p">:</span> <span class="o">.</span><span class="n">warning</span><span class="p">,</span>
                       <span class="nv">message</span><span class="p">:</span> <span class="s">"Watch out!"</span><span class="p">,</span>
                       <span class="nv">context</span><span class="p">:</span> <span class="s">"Session-14"</span><span class="p">,</span>
                       <span class="nv">timestamp</span><span class="p">:</span> <span class="kt">Date</span><span class="p">(),</span>
                       <span class="nv">file</span><span class="p">:</span> <span class="kd">#file</span><span class="p">,</span>
                       <span class="nv">function</span><span class="p">:</span> <span class="kd">#function</span><span class="p">,</span>
                       <span class="nv">line</span><span class="p">:</span> <span class="kd">#line</span><span class="p">)</span>

<span class="n">logger</span><span class="o">.</span><span class="nf">log</span><span class="p">(</span><span class="n">record</span><span class="p">)</span> <span class="c1">// the record is logged (because LogLevel.warning &gt;= logger.level)</span>

<span class="c1">// Convenience methods make logging more concise.</span>
<span class="n">logger</span><span class="o">.</span><span class="nf">warning</span><span class="p">(</span><span class="s">"Watch out!"</span><span class="p">,</span> <span class="nv">context</span><span class="p">:</span> <span class="s">"Session-14"</span><span class="p">)</span>

<span class="c1">// Examples of other log levels:</span>
<span class="n">logger</span><span class="o">.</span><span class="nf">severe</span><span class="p">(</span><span class="s">"This is also logged"</span><span class="p">)</span> <span class="c1">// because LogLevel.severe &gt;= logger.level</span>
<span class="n">logger</span><span class="o">.</span><span class="nf">info</span><span class="p">(</span><span class="s">"This is not logged"</span><span class="p">)</span>    <span class="c1">// because LogLevel.info &lt; logger.level</span>
</code></pre>

<p><code>Logger</code> is threadsafe.</p>
<div class="aside aside-see-also">
    <p class="aside-title">See also</p>
    <code><a href="Structs/Postgres.html#/s:17PostgresClientKit0A0V6loggerAA6LoggerCvpZ">Postgres.logger</a></code>

</div>

                          <a href="Classes/Logger.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">Logger</span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                  <li class="item">
                    <div>
                      <code>
                      <a name="/s:17PostgresClientKit9StatementC"></a>
                      <a name="//apple_ref/swift/Class/Statement" class="dashAnchor"></a>
                      <a class="token" href="#/s:17PostgresClientKit9StatementC">Statement</a>
                      </code>
                    </div>
                    <div class="height-container">
                      <div class="pointer-container"></div>
                      <section class="section">
                        <div class="pointer"></div>
                        <div class="abstract">
                          <p>A prepared SQL statement.</p>

<p>Use <code><a href="Classes/Connection.html#/s:17PostgresClientKit10ConnectionC16prepareStatement4textAA0F0CSS_tKF">Connection.prepareStatement(text:)</a></code> to create a <code>Statement</code>.</p>

<p>Call <code><a href="Classes/Statement.html#/s:17PostgresClientKit9StatementC7execute15parameterValues22retrieveColumnMetadataAA6CursorCSayAA0A16ValueConvertible_pSgG_SbtKF">Statement.execute(parameterValues:retrieveColumnMetadata:)</a></code> to execute the <code>Statement</code>,
specifying the values of any parameters.</p>

<p>A <code>Statement</code> can be repeatedly executed, and the values of its parameters can be different
each time.</p>

<p>When a <code>Statement</code> is no longer required, call <code><a href="Classes/Statement.html#/s:17PostgresClientKit9StatementC5closeyyF">Statement.close()</a></code> to release its Postgres
server resources.  A <code>Statement</code> is automatically closed by its deinitializer.</p>

<p>A <code>Statement</code> in PostgresClientKit corresponds to a prepared statement on the Postgres server
whose name is the <code>id</code> of the <code>Statement</code>.</p>

                          <a href="Classes/Statement.html" class="slightly-smaller">See more</a>
                        </div>
                        <div class="declaration">
                          <h4>Declaration</h4>
                          <div class="language">
                            <p class="aside-title">Swift</p>
                            <pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">class</span> <span class="kt">Statement</span> <span class="p">:</span> <span class="kt">CustomStringConvertible</span></code></pre>

                          </div>
                        </div>
                      </section>
                    </div>
                  </li>
                </ul>
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